CODEWITHSUNDEEP
c#streamwriter
user2772532
user2772532

Reputation: 25

C# | StreamWriter keeps replacing the current lines

So I have this application where there are 3 textboxes which ask the user for input. When the user has finished filling out the texboxes, there is a button that stores the input into a class.

Now the idea is that as the user presses the button to store the input a class, the input also gets stored into a textfile. The problem that I am facing now is that whenever a user adds new input, the old input gets replaced in the textfile.

This is the code:

using (StreamWriter txtFile = new StreamWriter(@"C:\Users\Desktop\smtp.txt"))
{
    txtFile.WriteLine(Class_Smtp[Index].SmtpClientName);
    txtFile.WriteLine(Class_Smtp[Index].SmtpPort);
    txtFile.WriteLine(Class_Smtp[Index].SmtpEmailExtension + Environment.NewLine);
}

Any Ideas?

Thank you in advance.

Upvotes: 0

Views: 259

Answers (2)

user2764860
user2764860

Reputation: 103

You should append the text

using (StreamWriter txtFile = new StreamWriter(@"C:\Users\Desktop\smtp.txt", true))
{
    txtFile.WriteLine(Class_Smtp[Index].SmtpClientName);
    txtFile.WriteLine(Class_Smtp[Index].SmtpPort);
    txtFile.WriteLine(Class_Smtp[Index].SmtpEmailExtension + Environment.NewLine);
}

Upvotes: 1

Matthew Watson
Matthew Watson

Reputation: 109567

Use the StreamWriter constructor override that accepts a bool parameter to tell it whether to append or replace, and pass true:

public StreamWriter(string path, bool append)

For your example:

using 
(
    StreamWriter txtFile = new StreamWriter
    (
        @"C:\Users\Desktop\smtp.txt", 
        true // <=== This parameter tells it to append
    )
)

Upvotes: 1

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